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Tunaliveneartheupperandmiddlewatersintheocean，mostlytropical，semitropicalandtemperatezonesinPacific，AtlanticandIndianOcean.Itcanswimasfastas160km／hour,evenfasterthanthefastestanimalontheearth.Ifatunastopsswim—ming，itwillchoke.Thereasonisitshouldalwayskeepitsmouthopen，letthewaterflowthroughitsgill，thusitcangetoxygenwhilebreathing.Inatuna'slife，ithastoconstantlyswimwithhighspeed，norestevenatnighttime.It'sbecauseofthis，tunafishisfamousforcontaininghighpro—teinandlowfat.金枪鱼是一种生活在海洋中上层水域的鱼类，分布在太平洋、大西洋和印度洋的热带、亚热带和温带，属大洋性高度洄游鱼类。金枪鱼身体呈纺锤形，最高时速可达每小时160公里，比陆地上跑得最快的动物还要快。金枪鱼若停止游泳就会窒息，原因是金枪鱼游泳时总是开着口，使水流经过腮部而吸氧呼吸，所以一生中它只能不停地持续高速游泳，即使在夜间也不休息。正是因为金枪鱼持续不断高速游泳，才使得金枪鱼肉具有高蛋白、低脂肪的特点。Peoplearemoreconcernedwithlivingquality,healthandflitbodynowadays.That'swhyTuna，thehealthyandlow—fatfood，isbecomingmoreandmorepopulartoda~金枪鱼当然是人体瘦身健美的最佳选择。i。。p弋／。M。f(h2007BilingualTimo045